WASHINGTON – Crime in the United States dropped dramatically in 2009, bucking a historical trend that links rising crime rates to economic woes. Property crimes and violent offenses each declined about 5 percent, the FBI said Monday, citing reports from law enforcement coast to coast.

It was the third straight year of declines, and this year’s drops were even steeper than those of 2007 and 2008, despite the recession.

There were words of caution from experts.

“It’s fabulous news, but I would draw an analogy to global warming: Even if you believe the long-term trend is increasing temperatures, it doesn’t mean you can’t have a cold year,” said Jonathan P. Caulkins, a professor of public policy at Carnegie Mellon University’s Heinz College.

Last year’s decline was 5.5 percent for violent crime, including 7.2 percent for murders. The rate for property crime was down 4.9 percent, the seventh consecutive drop for that category. The declines had been a more modest 1.9 percent for violent crime and 0.8 percent for property crime in 2008 and 0.7 percent and 1.4 percent respectively the previous year.

Long term, said Northeastern University criminology professor James Alan Fox, “there is a connection between an economic downturn and crime: Budget cuts create significant challenges in keeping crime rates low. We have increasing numbers of at-risk youth in the population, and they need services. We need to reinvest in crime prevention or else the good news we see today could evaporate.”

The nation’s jobless rate hit 10.2 percent last October, reaching double digits for the first time in 26 years. The rate was 9.9 percent last month.

Experts offered a range of factors that might have contributed to the drop in reported crimes.

In the past, increases during economic downturns have tended to correspond to street level drug activity. One example is the crack cocaine epidemic during the economic decline of the late 1980s and early 1990s, said Richard Rosenfeld, professor of criminology at the University of Missouri in St. Louis.

Factors “that often contribute to violence don’t seem to be there,” said Professor Alfred Blumstein of the Carnegie Mellon Heinz School, whose research over the past 20 years has covered many aspects of the criminal justice system.

Fox said the criminal justice system has done a good job of dealing with violence among at-risk youth, and police departments have better technology and other ways to gather information so law enforcement resources are used more effectively to investigate crime and apprehend offenders.

“There are a lot of tools that are keeping cops two steps ahead of the crooks,” said Fox.

The FBI collected the crime data from more than 13,000 law enforcement agencies around the country.

According to the numbers, all four measured categories of violent crime declined compared with 2008 – robbery, murder, aggravated assault and forcible rape.

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